| Date | Wed, 20 Feb 2008 22:50:09 +0100 | From | Patrick McHardy <> | Subject | Re: 2.6.25-rc2-mm1 - several bugs and a crash |
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Tilman Schmidt wrote: > Still, X came up fine, I could log in (Gnome feeling subjectively > a bit sluggish), call up a web page from the Internet in Firefox, > and start perusing the logs, when the whole system froze: neither > mouse nor keyboard would react anymore, and only the Wind^Wreset > button would put me back in control. After rebooting into the > previous, non-mm kernel I found this in the syslog: > > Feb 20 17:22:40 xenon kernel: [ 48.180297] BUG: using smp_processor_id() in preemptible [00000000] code: ntpdate/3562 > Feb 20 17:22:40 xenon kernel: [ 48.180297] caller is __nf_conntrack_find+0x9b/0xeb [nf_conntrack] > Feb 20 17:22:40 xenon kernel: [ 48.180297] Pid: 3562, comm: ntpdate Not tainted 2.6.25-rc2-mm1-testing #1 > Feb 20 17:22:40 xenon kernel: [ 48.180297] [<c02015b9>] debug_smp_processor_id+0x99/0xb0 > Feb 20 17:22:40 xenon kernel: [ 48.180297] [<fac643a7>] __nf_conntrack_find+0x9b/0xeb [nf_conntrack]
I guess the cause for this is a combination of preemtible RCU and conntrack using RCU since 2.6.25-rc. Using NF_CT_STAT_INC_ATOMIC should fix it, but I'd prefer to have a fix that doesn't increase overhead when regular RCU is used.
I'll see if I can find a better way to fix this tommorrow.
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